Java Struts 1 HTTP 状态 500

Question

我正在用 java web JSP Struts 1 编写我的第一个 helloworld web projet。我已经努力修复这个 HTTP 状态 500 错误。 任何帮助将不胜感激。 这是我的 githud 代码源： https : //github.com/paeltc/Struts1Demo1 。

这是我得到的回应：

HTTP Status 500 – Internal Server Error
Type Exception Report

Message java.lang.NullPointerException

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: java.lang.NullPointerException
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
    org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

java.lang.NullPointerException
    org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:289)
    org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:357)
    org.apache.struts.chain.commands.CreateActionForm.execute(CreateActionForm.java:92)
    org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
    org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
    org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Note The full stack trace of the root cause is available in the server logs.

我正在使用 Apache Tomcat/9.0.27

Answer 1

你笨拙地转换的包名给你带来了问题。

查看您的struts-config.xml文件（应该在您的问题中发布；问题必须尽可能独立）：

<form-bean name="helloStruts1Form" type="com.tpe.dev.form.HelloStruts1Form" />

现在查看代码中唯一名为HelloStruts1Form ：

package com.dev.tpe.form;

看到问题了吗？

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请参阅如何提问页面。